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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0444decc9f750bbc05b1109ab73a3829bae903620672e2b90b4a9694a3c153' 
  AND token = 'HVhsR1XzbAyhegf/ILpaLeyuHXRbb5rJ2uDEk9lqt58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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