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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcd89ec3ef0b79aee9cf200560aa281b291fc7cf6a12a15d43e525d45462803' 
  AND token = 'dRERs+wRedKoqo6lXe0ujPPf08IcZtBchu1F6W0ioKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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