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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97958b83a01d0e36fe4e3df9e8ee8cd1e41511b94565bedfeaa9461c7b3bf4b7' 
  AND token = 'PudwwrfvVnKLONWIL+ARsaI36Kx0cDAuVEON6Au6DSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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