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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fc30c332153ca385e84bd93d9ffce9dd06320bea167779c6e91c9f572fe2d9' 
  AND token = 'gy0drfwrWYwK4v1ALo65xwUVgJ6gVdF+z6r3jPkW4kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}