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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6241cfd3b2a680d8f31153f7f3fe3ce4976767e52bf428fe8826c35b7c0301a1' 
  AND token = 'L0EKO6hncI7mKhjRuoP9chfiWBKZbk0iTyaTIcw734Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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