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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bec7e74335c78bcf9c01d574be75f2cba2093301731505d420e4aca44f87639' 
  AND token = 'dRi1wYVZZsaB5FAIkdEolJPooY141DSiIOguw6YzRy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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