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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fba8761bab5ea6c91feb3b0a456885c2ec98ff369d5a7fb2b4018a45f0bc3b' 
  AND token = 'FG3lPgL6Rn7D0sd3xTFrAddxK/QMndAMThT+9ZrNpzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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