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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76bfd8e17f0b52230d5d9f8af154cd0ffcda185add81c607ba881a01f17b3bd' 
  AND token = 'Osqm/RTyOaE3LIe+nTYIY8oG6zs9tAvv2ryCPwKzY4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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