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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665efd4177802e9720e76907476c28fe37d773e25e38698f2feb058fc6a8bcc5' 
  AND token = 's01c0cn7sVluVCcOagxgHlia7xP/243KDlxDjH5g8qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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