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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd3bc5106a49fefff1a5a202775f7ed4ff8a791b12389b9e691857f7f8fbb47' 
  AND token = 'mxZIX1uURySYksIwQhURLx3A9zMYA3wS7pB7RhgkEHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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