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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e748493c7ecd8adbd9798c09c1f62afb63d5f6b3fad190b12583b3fd26cf85f9' 
  AND token = '96ZyXpZusYpmoNylEVWt/vWY4UoLXWZW4F/f5SHHqPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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