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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb408e70965d55c1f4e593e57243cdf8493f38a90e1a5c30c15c2b2713d5427' 
  AND token = 'yUbzt8FDFwZfxt+HmPa2zE8owSgGRYSCXNhYkq8MQnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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