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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107d39318a0e52bd3775919a088db0ad50644ec62eb07294be0687e70b6fcd3a' 
  AND token = '6DoBooW+2qJa7dnlywlLsDh/2D1SrbwLtlmfpYI+lb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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