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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e476f0480f9113b717587f28e7107b14b48d63b630bd701013298af0744cea' 
  AND token = 'xrtfd8ymMI0SUCKdSYku3b2LDb4HurF2SbaCfGwHv4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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