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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c815af85ad33f5cdc505f8f53f897a8404308b44e3336b0c5a4f81d4d99ebc11' 
  AND token = '+1GybWSrANE2PQQkLTZnjK29gvd8GlLj12TxaBPLWUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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