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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0478e84b33c6d339ff8432e347e3e266a28b0d14b896ed529bd639762c07da87' 
  AND token = 'WxUxWHnR8y0RExpiLJuWd0+oCuA2zkgIN1hQOm78aSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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