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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5657cfdb9f2f18e715a8f51ce9237d6010ba63b50f5f798c7edbdef6571857e' 
  AND token = 'qC48HuwEWhzpyQ15urfcgFlwHSBmky4qjwfq+M9KpUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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