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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c449f9de1b58916685ecec9f0244c23e98848c137020727a054a343e5c221cf' 
  AND token = '4rCy/Ulekjv8EJcxtPP1nLfy/cSU7pCztWnDth4G6qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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