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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dbd9d5f20cfc7a6369ebe105e3cd8f0827efd89c0f7a62f8133f131538ca91' 
  AND token = 'jXntDayYzFJnsMiGZ/p/5ymM54Cf8AuPDw57H7/brl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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