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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58423058c60b2c55066aee3ca0bf423cdbfe5559e1b11d9e1640082c443afd4' 
  AND token = '8kPfKhng47Iu97/Ynzn8Oiv/Z74+wi7rl/AIXSzxlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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