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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4061876c3bbb7d6181669c67660bf6af40eac7f401955a408ea2ef23c6a38b8b' 
  AND token = 'MYPDY6aaAeKf7rvW5wXy6W2QSz/jyoL5jwk+o6hkdng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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