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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4f9b4fe437056ffca7e614249cbc09b9a5bb911fa6ddc3407f6f2fdd4ed8cb' 
  AND token = 'g3J52exV3uFDqbqxLyw+xrp7Y6BGyGrBSP2Gv7L7xvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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