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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397b45beddf6b0c051a3e116eb89224d6393d0aaf2a0d1f9a2f86cf99ae613f1' 
  AND token = 'xCqqNUYNAe/H9UrVQ29/l8fJvQsNh6chN322CuCKZhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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