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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3df11c0c1fc8b9ea9b1de3d5de29d2d593547552e32e4474f07381ed5249070' 
  AND token = 'jqNLBbUcdoTt9kL4awcaCsdgGTeKK6XtiiINjp5F/hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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