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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7b2f5049929d7e4e4cee58961ce0c2e067829a0515a072f28da8441fe2d11f' 
  AND token = 'y+EexRle4JdbRQ28sWLBCRWLPp2piLD9CRSK8n1aZz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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