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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751be816302c03ab750ea53816d6d86bf6501aa145eace6953e27bae88ccc78a' 
  AND token = 'MTD15vQMmhshYm1QNZ5fwrr6iFp2L3zO6tMQT/L10iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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