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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0623d206e9e467af1578967648b5c4b43be44e1c6151c3f2ab2fecbcd66c1f' 
  AND token = 'JAOMsosyV3m3M0UI3ryfSdkY5KKuRkJRtkA4UThXXOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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