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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60bc862c8a390df30ea3678a4c9439ed5ce89cf1d5c4a3bf88c318b2d56fa5e' 
  AND token = 'WKHLDBoduCrTEae9kO4w+hB2+rEeAcO02TVm/Kn7f8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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