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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03daae19fd9df75a3ca709b92f40515c74ee3b307b808b1d04c69d468ad8c8e9' 
  AND token = 'ODhsjjSU63wENDx6S8ri2dRe1SGzRhwQSLm/Xqzkb3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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