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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86b00fa78af830fb04a5331b9d422847c10486f553a1c61c195c6f935412de7' 
  AND token = '0qQDqdr0LNOErbOM8dwstuvxbw+zpfJxRFw3/xyOwiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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