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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3381cd7aa2f02048ba040cdc2e7eedede45ca4f9d2fc2a8ae8a777a79a001c' 
  AND token = 'Vh7I3sV69tE7cU96eThjiXJl8weuawThCIcIgLonBV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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