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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00c25a84e7301191349bdbdbc3194bb88e55761a3ad38e2856e3718b3ce83ed' 
  AND token = 'ACtubVsKQCYCXiCxRaSHzfobN0F6stoSjnzSx4Tp1/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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